CN1047347A - Hot dipping calorization process for low-carbon steel - Google Patents
Hot dipping calorization process for low-carbon steel Download PDFInfo
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- CN1047347A CN1047347A CN 89103121 CN89103121A CN1047347A CN 1047347 A CN1047347 A CN 1047347A CN 89103121 CN89103121 CN 89103121 CN 89103121 A CN89103121 A CN 89103121A CN 1047347 A CN1047347 A CN 1047347A
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Abstract
This at first oil removing of processing requirement workpiece, rust cleaning help plating then, and the atom through helping plating workpiece metal surface is activated, and makes aluminium liquid and mother metal bonds well, and the composition of plating assistant agent (weight percent) is: NH
4F5-15+NaF30-40+KF45-65.Workpiece will be dried before hot-dip aluminizing using, and bake out temperature is 180-250 ℃.Hot-dip aluminizing using is aluminium liquid hot dipping 3-5 minute of workpiece being put into 700-800 ℃ of molten state, and aluminium liquid surface will add one deck insulating covering agent, and its composition (weight percent) is: KCl40-50+NaCl35-45+Na
3AIF
65-25 puts into cold rinse bank immediately and gets final product after the workpiece hot dipping.
Description
The invention belongs to the hot dipping alumetizing process of the chemical heat treatment method of metallic surface, particularly soft steel.
The metallic surface aluminising is that to be used to improve ferrous materials at present anticorrosive, improves one of the important means in work-ing life.The alumetizing process that adopts has many methods at present, in these methods, can remove workpiece oil removing, rust cleaning from before the processing requirement thermo-chemical treatment that has, but technological process requires soaking time long (4 hours), the batch process difficulty is big, and the smooth finish of workpiece surface is low, and dress erosion poor performance is as solid powder method.Some process workpiece surface decoration is preferable, but coating and metallic matrix bonding force are little.In use easily peel off and come off, influence work-ing life.
The purpose of this invention is to provide a kind of aluminizing method, both shortened the aluminising time, improve the dress erosion property of metallic surface again, provide good sash stuff in particular for building material industry.
Method of the present invention at first will be carried out pre-treatment to workpiece, remove oil and rust on the workpiece, oil removing is if carry out bad, be easy to produce the defect hole in the aluminising process, acid pickling and rust removing will adopt the dilute hydrochloric acid of being furnished with activator to eliminate rust, and rust cleaning will be according to the section bar corrosion situation, adjust activation and corrosion inhibition formula, excessively be easy to cause hydrogen embrittlement to adsorb a large amount of carbon blacks, therefore influence infiltration quality will control the suitable immersion time.Workpiece is handled through degreasing and rust removal, helps plating again, helps and puts into the aluminizing furnace aluminising after having plated drying.
Accompanying drawing 1 is the aluminising synoptic diagram.
Accompanying drawing 2 is the relation of hot dipping time (t) with thickness of diffusion layer (δ).
Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing.Workpiece is behind degreasing and rust removal; the soft steel workpiece to be helped plating; workpiece is after helping plating; at metal base surface formation passive film as thin as a wafer; protection mother metal surface is not oxidized; while is the atom on activated metal surface again, and the infiltration of raising and aluminium liquid promptly improves the diffusibility of aluminium atom in metallic matrix.The composition of plating assistant agent (weight percent) is: NH4F3-15+NaF30-40+KF45-65.Help to be plated in to help in the coating bath and carry out, helping the plating time is 5-10 minute.
Through helping the workpiece of plating, to dry before the infiltration, dry by the fire badly, easy generation pin hole during infiltration had dried by the fire just can destroy and had helped plated film, caused and oozed metallic surface downgrade afterwards.Will rationally select the stove temperature control for use, grasp reasonable time and furnace temperature, bake out temperature is 180-250 ℃, about 5 minutes time.The back aluminium that in aluminizing furnace, infiltrates of workpiece oven dry, as shown in Figure 1, aluminizing furnace is by crucible 3, body of heater 4, heating zone 6 is formed, and building around the crucible 3 has body of heater 4, and liquid aluminium 5 is in crucible 3, heating zone 6 heating aluminium, make it to become liquid state, workpiece 2 is hung solid by suspender 1, immerses in 700-800 ℃ the aluminium liquid 3-5 minute, propose workpiece 2 then, put into the cold rinse bank cooling and get final product.When hot-dip aluminizing using.Crucible 3 aluminium liquid surfaces need add one deck insulating covering agent.The composition (weight percent) of aluminium liquid insulating covering agent is: KCI40-50+NaCI35-45+Na3AIF
65-25.Contacting of main secluding air of insulating covering agent and aluminium liquid prevents aluminium liquid surface oxidation.Purify aluminium liquid, improve the smooth finish of workpiece surface.Put into cold rinse bank behind the workpiece hot-dip aluminizing using, the adherent insulating covering agent of workpiece surface can remove.By aluminising, the mutual diffusion and the displacement of aluminium and steel, form the chemical combination layer of AI-Fe on the workpiece metal surface, change the Chemical Composition of base material effectively, weave construction, improve physical and chemical performance, moreover, form the evenly aluminium upper layer of light of one deck at workpiece surface, two-layer like this alloy corrosion-resistant can be high, the appearance light is level and smooth, and dress erosion property is good.
As shown in Figure 2, the workpiece hot dipping time is long more, and thickness of diffusion layer is big more, grasps the regular hour, just can obtain the certain workpiece of alloying layer thickness.
Enumerate an embodiment below: select cold rolling steel sash steel tubing in different shapes for use, material is B3F, pipe length is 2600mm, wall thickness is 1.2mm, and the infiltration metal is selected industrial blunt aluminium for use, the steel sash tubing of anticipating is immersed carry out surface treatment in the water-soluble quickening liquid, immerse again after the drying in the 760-780 ℃ of immobilized infiltration molten metal, 3-5 minute infiltration time, with 8-16 rice/minute speed propose, soak aftertreatment again.B3F steel sash tubing, surfaces externally and internally gloss behind hot-dip aluminizing using, do not have to leak and ooze, phenomenons such as free of pinholes bubble, spot, infiltration layer continuously, through metallographicobservation, B3F material steel sash steel tubing in different shapes is divided into three layers after by hot-dip aluminizing using significantly: a, outermost layer are hung aluminium lamination (upper layer) for white bright fine-grannular, thickness is 40-60um, b, sublevel are the alloy layer of column, its thickness is 100-120um, its crystallographic direction and tube surfaces are perpendicular, are embedded in the matrix, and its metallographic composition mainly contains intermetallic compound.The crystal grain of c, mother metal matrix is slightly grown up, and alloy layer and matrix combine securely, and upper layer and alloy layer do not have leakage continuously and ooze pore-free, phenomenons such as pin hole.Upper layer hardness HV
0.160-130Kg/mm
2, metal level hardness HV
0.1680-780Kg/mm
2Simultaneously after tested, it has the performance of good resisting sulfide, ammoniacal liquor, chloride corrosion, under normal atmospheric condition, can use at least 100 years.
Method of the present invention is with short production cycle, and the production efficiency height is simple and practical, the workpiece antiseptic property height behind the hot-dip aluminizing using, and surface aesthetic, dress erosion performance is that other Metal Surface Heat Treatment can't realize, is particularly suitable for producing on the building material industry metal door and window.
Claims (5)
1, a kind of hot dipping calorization process for low-carbon steel, it is characterized in that hot-dip aluminizing using before, mother metal will be through helping plating, the composition of plating assistant agent (weight percent) is: NH4F5-15+NaF30-40+KF45-65.
2, hot dipping alumetizing process according to claim 1 is characterized in that drying before the aluminising, adds one deck insulating covering agent on molten state aluminium, and its composition (weight percent) is: KCl40-50+NaCl35-45+Na3AIF
65-25.
3, hot dipping alumetizing process according to claim 2 is characterized in that the preceding bake out temperature of aluminising is 180-250 ℃.
4,, it is characterized in that the hot-dip aluminizing using temperature is 700-800 ℃ according to claim 1 and 2 described hot dipping alumetizing process.
5,, it is characterized in that the hot-dip aluminizing using time is 3-5 minute according to claim 1 and 2 described hot dipping alumetizing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89103121 CN1047347A (en) | 1989-05-13 | 1989-05-13 | Hot dipping calorization process for low-carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89103121 CN1047347A (en) | 1989-05-13 | 1989-05-13 | Hot dipping calorization process for low-carbon steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1047347A true CN1047347A (en) | 1990-11-28 |
Family
ID=4854987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89103121 Pending CN1047347A (en) | 1989-05-13 | 1989-05-13 | Hot dipping calorization process for low-carbon steel |
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| CN (1) | CN1047347A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115861A (en) * | 2011-03-25 | 2011-07-06 | 东北大学 | Hot dipping covering agent |
| CN103320745A (en) * | 2013-07-08 | 2013-09-25 | 湖北交投四优钢科技有限公司 | Aluminized steel and preparation method thereof |
| CN103334547A (en) * | 2013-07-08 | 2013-10-02 | 湖北交投四优钢科技有限公司 | Aluminized corrugated tile and manufacturing method |
| CN103343613A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized steel fastener type scaffold steel pipe and preparation method thereof |
| CN103342012A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized steel sheet mesh and preparation method thereof |
| CN103343516A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized highway guardrail and preparation method |
| CN103484816A (en) * | 2012-06-13 | 2014-01-01 | 常州兰翔机械有限责任公司 | Calorizing impregnation agent for K4648 alloy and preparation method thereof, and calorizing method |
| CN106166640A (en) * | 2016-08-18 | 2016-11-30 | 上海闵轩钢结构工程有限公司 | A kind of high-strength steel and the welding procedure of aluminium alloy |
| CN111101092A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Novel efficient and stable hot aluminizing processing method |
-
1989
- 1989-05-13 CN CN 89103121 patent/CN1047347A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115861A (en) * | 2011-03-25 | 2011-07-06 | 东北大学 | Hot dipping covering agent |
| CN102115861B (en) * | 2011-03-25 | 2012-08-29 | 东北大学 | Hot dipping covering agent |
| CN103484816A (en) * | 2012-06-13 | 2014-01-01 | 常州兰翔机械有限责任公司 | Calorizing impregnation agent for K4648 alloy and preparation method thereof, and calorizing method |
| CN103343516A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized highway guardrail and preparation method |
| CN103343613A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized steel fastener type scaffold steel pipe and preparation method thereof |
| CN103342012A (en) * | 2013-07-08 | 2013-10-09 | 湖北交投四优钢科技有限公司 | Aluminized steel sheet mesh and preparation method thereof |
| CN103334547A (en) * | 2013-07-08 | 2013-10-02 | 湖北交投四优钢科技有限公司 | Aluminized corrugated tile and manufacturing method |
| CN103320745A (en) * | 2013-07-08 | 2013-09-25 | 湖北交投四优钢科技有限公司 | Aluminized steel and preparation method thereof |
| CN103320745B (en) * | 2013-07-08 | 2014-01-08 | 湖北交投四优钢科技有限公司 | Aluminized steel and preparation method thereof |
| CN103334547B (en) * | 2013-07-08 | 2015-09-30 | 湖北交投四优钢科技有限公司 | A kind of aluminising corrugated tile and preparation method |
| CN103343613B (en) * | 2013-07-08 | 2015-09-30 | 湖北交投四优钢科技有限公司 | A kind of alumetized steel design of coupler scaffold steel pipe and preparation method |
| CN103342012B (en) * | 2013-07-08 | 2015-12-02 | 湖北交投四优钢科技有限公司 | A kind of alumetized steel expanded metals and preparation method |
| CN103343516B (en) * | 2013-07-08 | 2016-08-10 | 湖北交投四优钢科技有限公司 | A kind of aluminising freeway guardrail and preparation method |
| CN106166640A (en) * | 2016-08-18 | 2016-11-30 | 上海闵轩钢结构工程有限公司 | A kind of high-strength steel and the welding procedure of aluminium alloy |
| CN111101092A (en) * | 2018-10-29 | 2020-05-05 | 兴化市中科渗铝钢管有限公司 | Novel efficient and stable hot aluminizing processing method |
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